Full error:

2020-05-30T14:05:05.137Z [27866] - error: [build] admin control panel styles build failed
2020-05-30T14:05:05.176Z [27866] - error: resource 'https://fonts.googleapis.com/css?family=Roboto:300,400,500,700' gave this Error:
Error: Client network socket disconnected before secure TLS connection was established
{"type":"File","filename":"/home/pi/nodebb/public/less/admin/paper/bootswatch.less","index":87,"line":5,"column":0,"callLine":null,"extract":["","@import url("https://fonts.googleapis.com/css?family=Roboto:300,400,500,700");",""]}